In my case I felt it better to do the MEI as initial, and did. Many others have as well. At the time the ME was the last class rating I had received and was currently flying. I reasoned that if I was current, competent and had a head full of a particular twin, including all its gouge and gotcha's, why not? It worked out fine and got me over that hump. This might work out well for Stef also, especially with her right seat time in the twins. What most CFI students don't adequately understand, going in, is all the studying necessary. I also feel the best route is to follow a standard syllabus, though develop your own lesson plans. These lesson plans are also living documents, subject to modification and refinement. I agree, get with a CFI and get off on the right foot with this endeavor. You might be suprised how far along you can get without setting foot in an airplane; this is more about teaching than flying anyway.